Peppe calculates its weight, lid included, at 1537 Ib.
From experiments made with this model, Penaud calculates that one horse-power would elevate and support 85 lb.
The solution of this problem has recently been attempted by Sir Norman Lockyer (Stonehenge and other British Stone Monuments), who calculates that on midsummer day, 1680 B.C., the sun would rise exactly over the Friar's Heel, and in a direct line with the axis of the temple and "avenue."
Hecker calculates that one-fourth of the population of Europe, or 25 millions of persons, died in the whole of the epidemics.
Perry (Steam Engine, p. 580), assuming a characteristic equation similar to Zeuner's (which makes v a linear function of the temperature at constant pressure, and S independent of the pressure), calculates S as a function of the temperature to satisfy Regnault's formula (10) for the total heat.